Objective: Characterize the prevalence of chronic physical illness types and mental illness and their comorbidity among adolescents and young adults (AYA) and assess the association of comorbidity on hospital utilization.
Methods: This study features a population-level sample of 61 339 insurance-eligible AYA with an analytic sample of 49 089 AYA (aged 12-21) in Vermont's 2018 all-payer database. We used multiple logistic regressions to examine the associations between physical illness types and comorbid mental illness and emergency department (ED) use and inpatient hospitalization.
Results: The analytic sample was 50% female, 63% Medicaid, and 43% had ≥1 chronic illness. Mental illness was common (31%) and highly comorbid with multiple physical illnesses. Among AYA with pulmonary illness, those with comorbid mental illness had 1.74-times greater odds (95% confidence interval [CI]: 1.49-2.05, P ≤.0005) of ED use and 2.9-times greater odds (95% CI: 2.05-4.00, P ≤.0005) of hospitalization than those without mental illness. Similarly, comorbid endocrine and mental illness had 1.84-times greater odds of ED use (95% CI: 1.39-2.44, P ≤.0005) and 2.1-times greater odds of hospitalization (95% CI: 1.28-3.46, P = .003), comorbid neurologic and mental illness had 1.36-times greater odds of ED use (95% CI: 1.18-1.56, P ≤.0005) and 2.4-times greater odds of hospitalization (95% CI: 1.73-3.29, P ≤.0005), and comorbid musculoskeletal and mental illness had 1.38-times greater odds of ED use (95% CI: 1.02-1.86, P = .04) and 2.1-times greater odds of hospitalization (95% CI: 1.20-3.52, P = .01).
Conclusions: Comorbid physical and mental illness was common. Having a comorbid mental illness was associated with greater ED and inpatient hospital utilization across multiple physical illness types.
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